Stereolithography(SLA)
a technique or process for creating three-dimensional objects, in which a computer-controlled moving laser beam is used to build up the required structure, layer by layer, from a liquid polymer that hardens on contact with laser light.
Digital Light Processing(DLP)
Digital Light Processing (DLP) is a display device based on optical micro-electro-mechanical technology that uses a digital micromirror device. This is technique used to aid the process of 3D printing while making an image inside hte printing for the printer to copy out into an actual object.
Fused deposition modeling (FDM)
Fused deposition modeling (FDM) is an additive manufacturing technology commonly used for modeling, prototyping, and production applications. It is one of the techniques used for 3D printing.